Freeman, 29, has seen little progress in contract talks with the Colts. He would serve as an upgrade alongside Trevathan over last year's duo of Shea McClellin and Christian Jones. Freeman in 2015 ranked behind only Carolina's Luke Kuechly at his position, per Pro Football Focus.

While Freeman is on the older side after spending part of his career with the CFL's Saskatchewan Roughriders, he played well against the run last season and helped pressure the pocket.

With talented coordinator Vic Fangio running Chicago's defense, Trevathan and Freeman -- if they land him -- would make this an intriguing unit in 2016.